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The carrier decides the shape of the whole experience.

	Alcohol-based	Oil-based
Opening	Loud — alcohol flashes off, throwing the top notes	Quiet — the oil holds them back
Projection	Large; scents a room	Small; scents an arm's length
Development	A clear arc through top, heart, base	Flatter; the base dominates early
Longevity on skin	Moderate	Long — often the longest of any format
On sensitive skin	Can sting and dry	Gentle
Travel	Liquid limits, flammable	No limits, not flammable

Oil perfumes wear longer and project less. That trade is the whole decision.

Because the opening is muted, oil perfumes suit base-heavy compositions — oud, sandalwood, amber, musk, resins, vanilla, rose absolutes — and suit bright citrus compositions poorly, since the format suppresses exactly the notes those depend on.

In its strict sense an attar is a natural essential-oil distillate traditionally captured in sandalwood oil, produced by hydrodistillation over long periods — ruh gulab (rose), mitti attar distilled from sun-baked earth after the first rains, shamama, and the rest. Sandalwood scarcity means many modern attars use other carriers or synthetic bases, and the word is now used loosely for any oil perfume.

That is worth knowing when buying: "attar" on a label is not a guarantee of natural materials or of a sandalwood base.

Carrier	Behaviour
Fractionated coconut oil (caprylic/capric triglyceride)	Light, colourless, odourless, very stable — the modern default
Jojoba	A liquid wax; extremely stable, close to skin sebum
Sweet almond, apricot kernel	Traditional; moderate stability
Dipropylene glycol (DPG)	Not an oil; a common commercial diluent, lighter and cheaper
Sandalwood	The traditional attar base; expensive and increasingly scarce

A dab, not a splash. Perfume oils are concentrated and applied directly, so a roller pass on each wrist and the base of the throat is usually enough. Press, do not rub.

Onto moisturised skin. Warmth helps — pulse points, the neck, behind the ears — and the scent builds over the first twenty minutes rather than arriving at once.

Oil stains fabric, particularly silk. Keep it on skin.

Direct, undiluted, occluded contact with a high fragrance load is the least forgiving exposure in this category. Patch test on the inner arm before committing, especially with artisanal oils.

Citrus-containing oils raise the phototoxicity question — furocoumarins in expressed citrus oils cause blistering and lasting pigmentation on sun-exposed skin, which is why IFRA restricts them in leave-on products. Keep citrus oils off skin that will meet the sun.

Cosmetic in the US — FDA primary category (05) fragrance preparations — with no premarket approval, and under 21 CFR 701.3 the fragrance may be declared simply as "fragrance".

In the EU, named fragrance allergens must be declared individually above 0.001% in leave-on products, and Regulation (EU) 2023/1545 expanded the declarable list from 26 substances to roughly 80, with transitions to 2028. Restricted materials, including oakmoss and treemoss and furocoumarins, are listed in Annex III.

Anhydrous, so no preservative is required. Not flammable, unlike alcohol-based perfume, and therefore not subject to the same transport restrictions.

Two to five years, depending entirely on the carrier: fractionated coconut and jojoba are extremely stable and last years; almond and apricot kernel go rancid within one to two.

A sharp, crayon-like or putty smell is oxidation of the carrier, and oxidised oils are irritants — a rancid perfume oil is worse than no perfume. Dark glass, cool storage, tightly closed.

• Fragrance — the shelf this sits on, and the rest of it.
• Cosmetics — what the label is legally allowed to say, and the full catalogue.
• The rest of Forms — Body Mist · Solid Perfume · Hair Perfume.
• Regulatory statements here follow the FDA and EU sources listed on Cosmetics, read 16 August 2026.